solve : x squared + x - 72 = 0
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Answer:
x=8 or -9
Step-by-step explanation:
x^2+x-72=0
=: x^2 + 9x -8x - 72=0
=:x( x+9)-8(x+9)=0
=:(x+9)(x-8)=0
=:x+9=0. x-8=0
=:x=-9. x=8
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