Question

Q9.From the sum of 3x²
- 5x + 2 and -5x²
- 3x + 9 subtract 4x²
- 3x + 9​

Answer 1

Answer:

$-6x^{2} -5x+2$

Step-by-step explanation:

$[3x^{2} -5x+2)+(-5x^{2} -3x+9)]- (4x^{2} -3x+9)$

$[3x^{2} -5x+2-5x^{2} -3x+9]- (4x^{2} -3x+9)$ (open the bracket)

$[+11-2x^{2} -8x]- (4x^{2} -3x+9)$

$[+11-2x^{2} -8x]- 4x^{2} +3x-9$

$-6x^{2} -5x+2$