i hope you mean (2x^2 + 21x + 49)
you cant solve it its already in its lowest possible form
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(2x+7)(x+7)
7(3x+7)
Remember in algebra any operation you do to one side of the equaution and also to the other side does not affect the eqaution 8x + 7 = 2x + 49 subtract 2x from both sides 6x + 7 = 49 subtract 7 from both sides 6x = 42 divide both sides by 6 x = 7
4x2+28x+49 = (2x+7)(2x+7) when factored
9t2 + 42t + 49 is a perfect square, equal to (3t + 7)2