X 2 +x-72 using identity x 2 +qx+r
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x² + x - 72
x² +9x -8x - 72
x(x +9) -8(x+ 9)
( x+9 ) (x-8)
∴ x= -9 and x = 8
hope it's help u
x² +9x -8x - 72
x(x +9) -8(x+ 9)
( x+9 ) (x-8)
∴ x= -9 and x = 8
hope it's help u
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