2b^2 - 14b + 28 <=> 2b(b -7) + 28
b + _(b - 3 = 0 (b > 0) <=> b^2 - 2b = 0 <=> b^2 = 2b <=> b = 2
2b(b - 7) + 28 = 4(-5) + 28 = 8
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2b^2 - 14b + 28 <=> 2b(b -7) + 28
b + _(b - 3 = 0 (b > 0) <=> b^2 - 2b = 0 <=> b^2 = 2b <=> b = 2
2b(b - 7) + 28 = 4(-5) + 28 = 8