Maths-
General
Easy

Question

If (3x-4) (5x+7) = 15x2-ax-28, so find the value of a?

hintHint:

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)

                                   rightwards double arrow 3x(5x+7) - 4(5x+7)

                                   rightwards double arrow15x2 + 21x - 20x - 28

                                   rightwards double arrow15x2 + 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.

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