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WAEC Mathematics Past Questions & Answers - Page 246

1,226.

solve the inequality (Y3)<y3

A.

y > -9

B.

y < 3

C.

y > 4

D.

y < 9

E.

y > 0

Correct answer is C

(Y3)<y33y9<y2y<9y<412

1,227.

Find (X-Y) if 4x - 3y = 7 and 3x - 2y = 5

A.

4

B.

3

C.

2

D.

-2

E.

-3

Correct answer is C

No explanation has been provided for this answer.

1,228.

Find the equation whose roots are 23and14

A.

12x25x+2=0

B.

12x211x+2=0

C.

x21112x+2=0

D.

x2+1112x2=0

E.

12x2+11x+2=0

Correct answer is A

x2 - (sum of given roots)x + (product of given roots ) = 0
x2 - (23+14)x + (2314) = 0

x2 - (8312)x + (212)

x2512x + 212

multiply through by the LCM 12

12 * x2 - 12 * 512x + 12 * 212

12x2 - 5x - 2 = 0

1,229.

Make S the subject of the formula: V=KTS

A.

TK2V2=S

B.

T+K2V2=S

C.

TK2V=S

D.

TKV=S

E.

TKV2=S

Correct answer is A

V=KTS
square both sides of the equation
V2=K2TS
cross multiply
V2TS=K2
TS=K2V2
T=K2V2+S
T=K2V2=S

1,230.

For what value of x is the expression

not defined?

A.

3, 1

B.

-1, -3

C.

-1, 3

D.

3, -2

E.

1, -3

Correct answer is C

x2 - 2x - 3 = 0
x2 - 3x + x - 3 = 0
x(x - 3) + (x - 3) = 0
(x + 1)(x - 3) = 0
x = -1 or 3