Question

What is the sum or difference 4x10 – 9x10 (1 point) –5x10 –5x20 –36x10 –36x20

Answer 1

4×10-9×10=-50
-5×10-5×20-36×10-36×20=-870

Answer 2

(a) $4x^{10} - 9x^{10}$

Both terms $4x^{10}$ and $- 9x^{10}$ are like terms

They have same exponent $x^{10}$

So we add or subtract the coefficents

4 - 9 is -5

$4x^{10} - 9x^{10}$ = $- 5x^{10}$

(b) $-5x^{10} - 5x^{20} - 36x^{10} - 36x^{20}$

Combine like terms by adding or subtracting the coefficient of like terms

$-5x^{10} - 36x^{10} - 5x^{20} - 36x^{20}$

$-41x^{10} - 41x^{20}$