How do you simplify #x^2-5x+3(x^2+7x)#?

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Answer 1 · 2018-04-18T14:10:43

Distribute and combine like terms.

Distribute the 3 among the terms inside parentheses:

#x^2-5x+3(x^2+7x)=x^2-5x+3x^2+21x#

Combine like terms.

#x^2-5x+3x^2+21x=4x^2+16x#

#=4x^2+16x#

Answer 2 · 2018-04-18T14:12:45

#x=0,-4#

Simplify, then factor

#x^2 - 5x + 3x^2 + 21x#
#4x^2+16x#
#x^2+4x#
#x(x+4)#
#x=0, x+4=0#
#therefore#
#x=0,-4#