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(2x+3)²=(x-7)²
(4x²+12x+9)=(x²-14x+49)
3x²+26x-40=0
(3x-4) (x+10)
x=4/3 x=-10
pembuktian : x=4/3⇒ 2(4/3)+3=4/3-7 x=-10⇒ 2(-10)+3=-10-7
8/3+9/3=4/3-21/3 -20+3 =-17
17/3 =-17/3 -17 =-17
17/3=|17/3| (hasil benar) (hasil benar)
maka HP nya adalah {4/3,-10}