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1.1
Unit 1 revision Q 1
•What is the perpendicular bisector of a line ?
Answer to Unit 1 revision Q 1
•A line which cuts the given line in half at 90o
1.1
Unit 1 revision Q 2
•How do you find the median AM of triangle ABC ?
Answer to Unit 1 revision Q 2
•(i) find the mid pointof BC. Call it M
(ii) find the gradient of AM(iii) use y-b = m(x-a)
A
BCM
1.1
Unit 1 revision Q 3
•What is the gradient of a vertical line ?
Answer to Unit 1 revision Q 3
•undefined
x
y
1.1
Unit 1 revision Q 4
•How do you find where two lines intersect ?
Answer to Unit 1 revision Q 4
•Simultaneous equations
1.1
Unit 1 revision Q 5
•What two things do you require in order to find the equation of a straight line ?
Answer to Unit 1 revision Q 5
•The gradient of the line and a point on the line
x
y
(a,b)m
1
1.1
Unit 1 revision Q 6
•What is thegeneral equationof a straightline passingthrough (a,b)with gradient m ?
x
y
(a,b)
Answer to Unit 1 revision Q 6
•y – b = m(x – a)
x
y
(a,b)
1.1
Unit 1 revision Q 7
•How do you find the gradient of a line, given the angle the line makes with the positive direction of the x-axis ?
Answer to Unit 1 revision Q 7
•m = tan Θ
x
y
ΘΘ
1.1
Unit 1 revision Q 8
•What is the gradient of a horizontal line ?
Answer to Unit 1 revision Q 8
•0
x
y
1.1
Unit 1 revision Q 9
•What is an altitude of a triangle ?
Answer to Unit 1 revision Q 9
•A line from a vertex, perpendicular to the opposite side
1.2
Unit 1 revision Q 10
•How do you change from degrees to radians ?
Answer to Unit 1 revision Q 10
•Divide by 180 and multiply by π
1.2
Unit 1 revision Q 11
•What is an equivalent expression fory = ax
using logs ?
Answer to Unit 1 revision Q 11
•x = logay
1.2
Unit 1 revision Q 12
•How do you solve an equation like3sinx+1 = 0 ?
Answer to Unit 1 revision Q 12
•(i) rearrange to sinx =(ii) decide on 2 quadrants(iii) ignore any –ve and press INV sin to get angle(iv) work out two answers
1.2
Unit 1 revision Q 13
•How do you draw the graph of 3+f(x) given the graph of f(x) ?
Answer to Unit 1 revision Q 13
•move graph up 3
1.2
Unit 1 revision Q 14
•How do you find the exact values of sin x or tan x givencos x = a ?
b
Answer to Unit 1 revision Q 14
•(i) draw triangle(ii) use Pythagoras
to fill in missing side(iii) read values off triangle using SOHCAHTOA
a
b
xx
1.2
Unit 1 revision Q 15
•How do you draw the graph of –f(x) given the graph of f(x) ?
Answer to Unit 1 revision Q 15
•Reflect the graph in the x-axis
1.2
Unit 1 revision Q 16
•Which two points does the graph of y = logax always pass through ?
Answer to Unit 1 revision Q 16
•(1,0) and (a,1)
1.3
Unit 1 revision Q 17
•If f(x) = xn
then what isf’(x) ?
Answer to Unit 1 revision Q 17
•nxn-1
1.3
Unit 1 revision Q 18
•How doyou showthat a curveis always decreasing?
Answer to Unit 1 revision Q 18
• (i) differentiate(ii) show that f’(x)
is always negative e.g. –(x+a)2 , x = a
1.3
Unit 1 revision Q 19
•For a curve, how do you find the stationary points and their nature ?
Answer to Unit 1 revision Q 19
(i) differentiate(ii) let f’(x) = 0(iii) solve to find
stationary points(iv) find y-coordinates(v)draw nature table
1.4
Unit 1 revision Q 20
•How do you know when a recurrence relation of the form un+1 = aun + b converges ?
Answer to Unit 1 revision Q 20
•-1 < a < 1