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Popular >

simplify (-4r^5)(2r^8)

Solution

simplify

(- 4 r^{5}) (2 r^{8})

Solution

- 8 r^{13}

Solution steps

(- 4 r^{5}) (2 r^{8})

Apply rule:

(- a) = - a

(- 4 r^{5}) = - 4 r^{5}

= - 4 r^{5} \cdot 2 r^{8}

Multiply the numbers:

- 4 \cdot 2 = - 8

= - 8 r^{5} r^{8}

Apply exponent rule:

a^{b} \cdot a^{c} = a^{b + c}

r^{5} r^{8} = r^{5 + 8}

= - 8 r^{5 + 8}

Add the numbers:

5 + 8 = 13

= - 8 r^{13}

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Frequently Asked Questions (FAQ)

What is (-4r^5)(2r^8) ?
The solution to (-4r^5)(2r^8) is -8r^{13}