Question

plz fast I mark you as brainlinest​

Answer 1

Answer:

1) 2a² - 7²

= 4a² - 49

2) b² - 14b + 49

Step-by-step explanation:

hope it helps

mark as brainliest

Answer 2

Answer: See below

Step-by-step explanation:

(2a+7) (2a-7)

=2a(2a-7)+7(2a-7)

=$4a^{2}$-14a + 14a -49

=$4a^{2}$-49

$(b-7)^{2}$

Here there are two terms within brackets, so three terms will come for answer .

Draw three blanks and keep.

1st blank: Square of first term = $b^{2}$

2nd blank: multiply first term and second term and again multiply the product by 2. = 7 x b x 2 = 14b

If both terms have different signs, then the sign of the second term in the answer will come in negative.

So, -14b

3rd blank: Square of the second term = 49

NOTE: 1st and Last term will always come in positive.

So answer is $b^{2}$-14b+49

Hope that it was understandable.

If my answer was helpful, please mark me as brainliest.