Solve and write if the equation is a Quadratic Equation.
1. 3(x+7)=0
2. 2x(x-4)=0
3. 7(x+1)-2x=0
4. (x-3)(x+1)=0
5. (x+4)²=0
1. 3(x+7)=0
2. 2x(x-4)=0
3. 7(x+1)-2x=0
4. (x-3)(x+1)=0
5. (x+4)²=0
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Answer:
1. 3(x + 7) = 0
3x + 21 = 0
NOT QUADRATIC EQUATION
2. 2x(x - 4) = 0
2x² - 8x = 0
QUADRATIC EQUATION
3. 7(x + 1) - 2x = 0
7x + 7 - 2x = 0
5x + 7 = 0
NOT QUADRATIC EQUATION
4. (x - 3)(x + 1) = 0
x² + x - 3x - 3 = 0
x² - 2x - 3 = 0
QUADRATIC EQUATION
5. (x + 4)² = 0
(x + 4)(x + 4) = 0
x² + 4x + 4x + 16 = 0
x² + 8x + 16 = 0
QUADRATIC EQUATION