Question

Identify the errors in the following statements and also correct them :
1. 3x(5x + 3) = 15x2 + 3
2. (7x - 3) (2x - 5) = 14x2 + 15
3. (2x + 9) (2x - 3) = 4x2 + 6x – 18
4. (5x - 3)2 = 25x2 + 9
5. (3x2 – 5) (3x2 + 5) = 9x2 – 25
6. 7x + 3x + x = 10x
x2 + 5x + 6
4x
7.
= x + 7
8.
2x² – 2x² = 0
x + 3
2x
- 2x²
9.
2x+ + 7x + 5
= x + 7
2x + 5
10. 5x3 (2x - 3) - 6x3 = 10x4 - 3 - 6x3​

Answer 1

Answer:

1.3x(5x + 3) = 15x²+9x

2. (7x - 3) (2x - 5) = 14x²-41x + 15

3. (2x + 9) (2x - 3) = 4x² + 6x -27

4. (5x - 3)² = 25x² + 9 - 30x

5. (3x² – 5) (3x² + 5) = (3x²)²– 25

6. 7x + 3x + x = 11x

7. x² + 5x + 64x = x² + 70x

8.2x² – 2x² = 0

9. x + 32x - 2x²+ 2x+ 7x + 5 = -2x² + 42x + 5

10. 5x³(2x - 3) - 6x³ =10 x⁴-21x³