Question

What will be the value of ‘a’ if the value of 7x2 + 5x + a equals 7, for x = (–3 )

Please answer it​

Answer 1

Answer:

a= -41

Step-by-step explanation:

7x^2+5x+a=7

we know that x= -3

7(-3)^2+5(-3)+a=7

7(9)-15+a=7

63-15+a=7

48+a=7

a=7-48

a=-41

Answer 2

Given Equation

⇒ 7x² + 5x + a = 7

Where

⇒x = (-3)

Now put the value x = -3 on given Equation

⇒7(-3)² + 5(-3) + a = 7

⇒7×9 -15 + a =7

⇒63 - 15 + a = 7

⇒48 + a = 7

⇒a = 7-48

⇒a = -41

Answer

⇒Value of a = -41

Now check our answer

⇒ 7x² + 5x + a = 7

Put x = -3 and a = -41

⇒7(-3)² + 5(-3) + (-41) = 7

⇒7×9 -15 -41 =7

⇒63 - 15 -41 = 7

⇒48 -41  = 7

⇒7 = 7

Hence Verified