Question

2^2+4^2 +6^2+...............20^2 is​

Answer 1

Answer:

Step-by-step explanation:

⇒ 2²+4²+6²-------20²

⇒(2×1)²+(2×2)²+(2×3)²----------(2×10)²

⇒2² ×(1²+2²+3²-------10²)

⇒4 ×(1+4+9+16+25+36+49+64+81+100)

⇒4×385

⇒1540

Hope it will help you