(x + 12)(x - 3)
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49x2 - 84x + 36 = (7x - 6)(7x - 6) or (7x - 6)2
x^(2) - 12x + 36 Look for two factors of '36', that add/subtract to '12'. ;- 1,36 ; 2,18; 4,9; 6,6. The last pair 6 & 6 add to ;12; Hence (x 6 )(x 6) Which signs???? Since '36' is positive(+), then both the signs are the same. They can be both negative , or both positive. Since the sign in '12x' is hegative then they are both negative. Hence (x - 6)(x - 6) Done!!!!!
x(x2 + 36)
(x - 6)(x^2 + 6x + 36)
(x + 4)(x + 9)