Question

# If (3x-4) (5x+7) = 15x^{2}-ax-28, so find the value of a?

Hint:

### While evaluating the expression just put the values and perform basic operations.

## The correct answer is: Hence, the value a is -1.

### Answer:

- Step by step explanation:

○ Given:

○ Two terms.

(3x-4) (5x+7) = 15x^{2}-ax-28

○ Step 1:

○ Simplify the right side:

○ (3x-4) (5x+7)

3x(5x+7) - 4(5x+7)

15x^{2 }+ 21x - 20x - 28

15x^{2 }+ x - 28

○ Step 1:

○ compare both side:

15x^{2 }+ x - 28 =15x^{2}- ax - 28

By comparing we get

a = -1

- Final Answer:

Hence, the value a is -1.

^{2}-ax-28

○ Step 1:

○ Simplify the right side:

○ (3x-4) (5x+7)

^{2 }+ 21x - 20x - 28

^{2 }+ x - 28

○ Step 1:

○ compare both side:

^{2 }+ x - 28 =15x

^{2}- ax - 28

By comparing we get

### Related Questions to study

### The difference of x^{4}+2x^{2}-3x+7 and another polynomial is x^{3}+x^{2}+x-1. What is the

another polynomial?

### The difference of x^{4}+2x^{2}-3x+7 and another polynomial is x^{3}+x^{2}+x-1. What is the

another polynomial?

### Use the product of sum and difference to find 83 × 97.

This question can be easily solved by using the formula

(a + b)(a - b) = a2 - b2

### Use the product of sum and difference to find 83 × 97.

This question can be easily solved by using the formula

(a + b)(a - b) = a2 - b2

### Determine the gradient and y-intercept from the following equation: 4x + y = -10

### Determine the gradient and y-intercept from the following equation: 4x + y = -10

### Use the product of sum and difference to find 32 × 28.

This question can be easily solved by using the formula

(a + b)(a - b) = a2 - b2

### Use the product of sum and difference to find 32 × 28.

This question can be easily solved by using the formula

(a + b)(a - b) = a2 - b2