Question

$(3x + 4y)(x + 5y)$
answer it with full explanation​

Answer 1

Answer:

3x² + 19xy + 20y²

Step-by-step explanation:

We know that (a + b) (c + d) = ac + ad + bc + bd

= (3x × x) + (3x × 5y) + (4y × x) + (5y × 4y)

= 3x² + 15xy + 4xy + 20y²

= 3x² + 19xy + 20y²

Answer 2

Answer:

REFER TO THE ATTACHMENT

Your answer is

3x² + 19x + 20y²

(on multiplying like terms)