Question

factorise 81-49xsquare​

Answer 1

Answer:

=(9+7x)(9-7x)

Step-by-step explanation:

81-49x^2

=(9)^2 -(7x)^2

Using identity a^2-b^2 =( a+b)(a-b)

=(9+7x)(9-7x)

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Answer 2

Answer:(9 + 7x)(9 - 7x)

Step-by-step explanation:

Here, we can see that both terms are squares of a integer.

81 = 9^2 and 49x^2 = 7x.

= 9^2 - (7x)^2.

We know that a^2 - b^2 = (a+b)(a-b).

Here, a is 9 and b is 7x.

Hence, 81 - 49x^2 = (9 + 7x)(9 - 7x).

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