Question

(2x + 3)(2x + 5)
please answer my question​

Answer 1

Answer:

4x ^2 + 16x + 15

Step-by-step explanation:

Here we can use the formula ⇒  (x + a) (x + b) = x^2 + (a + b)x + ab

x = 2x

a = 3

b = 5

(2x)^2 + ( 3 + 5)2x  + (3×5)

⇒ 4x^2 +8 × 2x + 15

Ans ⇒ 4x ^2 + 16x + 15

Hope this will help you

Answer 2

Answer:

$x=\frac{-3}{2} or x=\frac{-5}{2}$

Step-by-step explanation:

(2$x$+3)(2$x$+5)

⇒{2$x$×(2$x$)+2$x$×(5)}+3×(2$x$)+3×(5)

⇒4$x^{2}$+10$x$+6$x$+15

⇒4$x^{2}$+16$x$+15

By applying middle term factorisation method,

⇒4$x^{2}$+10$x$+6$x$+15

By taking commons,

⇒2$x$(2$x$+5)+3(2$x$+5)

⇒(2$x$+3) (2$x$+5)=0

Either,

2$x$+3=0

2$x$=-3

$x$= $\frac{-3}{2}$

Or,

2$x$+5=0

⇒2$x$=-5

⇒$x$ =$\frac{-5}{2}$