Question

7. From the sum of 9x 2 – 12x + 4 and – 4x2 + 5x + 8,
subtract 9x2 - 10x +12.​

Answer 1

Answer:

-4x^2 + 3x

Step-by-step explanation:

9x^2 - 12x + 4 + { - 4x^2 + 5x + 8 } - {9x^2 - 10x+12}

9x^2 - 12x + 4 - 4x^2 + 5x + 8 - { 9x^2 - 10x+ 12}

5x^2 - 7x + 12 - 9x^2 + 10x - 12

-4x^2 + 3x

Answer 2

Answer:

4x²-17x+24

Step-by-step explanation:

Sum

9x²-12x+4 + 4x²+5x+8

= 9x²+4x²-12x+5x+4+8

=13x²-7x+12

Substraction

13x²-7x+12 - (9x²-10x+12)

=13x²-7x+12-9x²-10x+12......sign changes in substraction.

=13x²-9x²-7x-10x+12+12

=4x²-17x+24