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15x+6-3x+4
12x+10.
b. 2(5x+2)(5x+2)
2(25x^2+20x+4)
50x^2+40x+8
= 15x+6 - 3x +4
= 12x + 10
b. 2a² = 2 (5x+2)²
= 2 (25x² + 20x + 4)
= 50x² +40x +8