Asked by jessica
Find the solutions to each quadratic by factoring
x^2+3x-18=0
3x^2-9x=o
x^2-10x+21=0
5x^2+30x+45=0
x^2+3x-18=0
3x^2-9x=o
x^2-10x+21=0
5x^2+30x+45=0
Answers
Answered by
Reiny
what method have you learned?
They all look pretty straightforward,
in the last one, first divide each term by 5, then it is easy.
x^2+3x-18=0
what two numbers multiply to get -18 and add to get +3 ?
mmmh, how about 6 and -3
(x+6)(x-3) = 0 , (expand it to verify)
x = -6 or x = 3
etc.
They all look pretty straightforward,
in the last one, first divide each term by 5, then it is easy.
x^2+3x-18=0
what two numbers multiply to get -18 and add to get +3 ?
mmmh, how about 6 and -3
(x+6)(x-3) = 0 , (expand it to verify)
x = -6 or x = 3
etc.
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