If (4, b) is a point on the graph of y = 3x² + 4x, what is b? y = 3x² + 4x (4,b) is a point b = 3(4)² + 4(4) {substituted 4 for x and b for y} b = 3(16) + 16 {evaluated exponent and multiplied 4 by 4} b = 48 + 16 {multiplied 3 by 16} b = 64 {added}  Algebra House
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