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OpenStudy (anonymous):
can someone help me factor x^2 + 6x + 72?
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jhonyy9 (jhonyy9):
x_1,_2=(-6+/-sqrt(36-288))2=(-6+/-sqrrt(-252))/2=(-6+/- isqrt(4*9*7)/2 = =2(-3+/- 3isqrt7)/2 = -3+/- 3isqrt7
jhonyy9 (jhonyy9):
= -3(1+/- isqrt7)
jhonyy9 (jhonyy9):
than this will be -3(x-(1-isqrt7))(x+(1+isqrt7))
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