Question

Solve the (4x + 5)whole square by using formula.​

Answer 1

Step-by-step explanation:

i don't understand which formula u are talking about, but I'm gonna do with ones i know.

(4x + 5)²

w.k.t: (a + b)² = a² + b² + 2ab

= 16x² + 25 + 40x

= 16x² + 20x + 20x +25

= 4x (4x + 5) + 5 (4x + 5)

= (4x + 5) (4x + 5)

x = -5/4

or , 16x² + 40x +25

x = [ - 40 +- _/ 1600 - 4(16)(25) ] / 2(16)

= [- 40 +- _/ 1600 - 1600 ] / 32

= (-40 +-0 )/32 = - 40/32

= - 5/4

or, (4x + 5)² = (4x + 5) (4x + 5)

putting equal to 0:

4x +5 =0

x = -5/4