Wie vereinfache ich diese Terme?

Question

(a+4b)^2+(7a+b)(7a-b)

(3,5a+b)^2+(a+1,5b)

Answer 1

(a + 4·b)^2 + (7·a + b)·(7·a - b)

= a^2 + 8·a·b + 16·b^2 + 49·a^2 - b^2

= 50·a^2 + 8·a·b + 15·b^2

----------------------------------------------------------------------------------------------------

(3.5·a + b)^2 + (a + 1.5·b)

= 12.25·a^2 + 7·a·b + b^2 + a + 1.5·b