Question

Simplify and factorise: 3x² + 5x -12 -2x² + 2x +24
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Answer 1

x² + 7x + 12

Step-by-step explanation:

arrange 3x² + 5x -12 -2x² + 2x +24 in correct order.

3x² - 2x² + 5x + 2x - 12 + 24 do the operation for the same exponents.

3x² - 2x² = x²

5x + 2x = 7x

-12 + 24 = 12 ( the sign of the largest number will be the sign of the answer).

x² + 7x + 12

Answer 2

Answer:

-3 and -4

Step-by-step explanation:

3x² +5x -12 -2x² +24

3x² -2x² -5x +2x -12 +24

x² +7x +12

Sum = 7

Product = 12

Split = 4× 3

x² + 3x + 4x + 12

x(x+3) + 4(x+3)

(x+3) (x+4)

Therefore x= -3, -4