factorise
(A) x^2+5x-84
(B) 81-16x^2
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Answer:
Ans A.
Let's factor x2+5x−84
x2+5x−84
The middle number is 5 and the last number is -84.
Factoring means we want something like
(x+_)(x+_)
Which numbers go in the blanks?
We need two numbers that...
- Add together to get 5
- Multiply together to get -84
Can you think of the two numbers?
- Try -7 and 12:
-7+12 = 5
-7x12 = -84
- Fill in the blanks in
(x+_)(x+_)
- with -7 and 12 to get...
(x-7)(x+12)
Ans B.
Factor 81−16x2
= −16x2+81
=(4x+9)(−4x+9)
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