Question
If (3x-4) (5x+7) = 15x2-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) = 15x2-ax-28
○ Step 1:
○ Simplify the right side:
○ (3x-4) (5x+7)
3x(5x+7) - 4(5x+7)
15x2 + 21x - 20x - 28
15x2 + x - 28
○ Step 1:
○ compare both side:
15x2 + x - 28 =15x2- ax - 28
By comparing we get
a = -1
- Final Answer:
Hence, the value a is -1.
○ Step 1:
○ Simplify the right side:
○ (3x-4) (5x+7)
3x(5x+7) - 4(5x+7)15x2 + 21x - 20x - 2815x2 + x - 28○ Step 1:
○ compare both side:
By comparing we get
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Use the product of sum and difference to find 32 × 28.
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