Question

please slove it it's important​

Answer 1

1- coefficient of x is 4

2-  (101)². = ( 100 + 1 )² = (100)² + (1)² + 2 × 100 × 1.

. [ Using identity :- ( a + b )² = a² + b² + 2ab. ]

3. using identity

${a + b}^{2} - {a - b}^{2} = 4ab$

in (3a+b)² - (3a-b)², a= 3a and b = b

so = 4×3a×b = 12ab

4. Let A=2a(a−3b+5c)

B=5a(2a−3c+b)

According to the question,

B-A

=5a(2a−3c+b)−2a(a−3b+5c)

=10a2−15ac+5ab−2a2+6ab−10ac

ANS =8a2−25ac+11ab

5. (87-13) × ( 87+13) = 74×100 = 7400

6. parallelogram

7. the total surface area of cylinder = 2πr(h + r)

hope it helps..