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Solve each equation by factoring, PLZ HELP!!

Solve Each Equation By Factoring PLZ HELP class=

Sagot :

1) x^2=64 is the same as x=the root of 64 which gives us: (+-)8

2) here you must us pq-formel as:

5m^2-5m=60

5m^2-5m-60=0

(m^2-5m-60)/5=0

m^2-m-12=0

m=0,5(+-) the root of 0,25+12

m=0,5(+-)3,5

m1=0,5+3,5

m2=0,5-3,5

15) x^2=7x

x^2-7x=0 here there is two x, so:

x(x-7)=0

x1=0

x2=7

Here you can only use PQ formula in all the others, just as I did in the question number 2
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