Question

Solve the following quadratic equation: (x + 3)2 = 16.
A. x = -3, -4
B. x = 1
C. x = -1, 7
D. x = 1, -7

Answer 1

There are two ways to go about solving it

Answer 2

I will go with the easy approach first:
Which quantity when sqaured will give 16?

Answer 3

4

Answer 4

4 is right! Any other number you can think which when squared gives 16

Answer 5

not that i can think of

Answer 6

what abt -4.........what happens when you square (-4)

Answer 7

-16

Answer 8

nope

Answer 9

that what my calculator shows

Answer 10

squaring -4 also gives 16
(-4)^2 =16

Answer 11

put brackets around -4 and then see in your calculator

Answer 12

gotcha -x-=+ i should have remembered that

Answer 13

can you solve the question now

Answer 14

oh and there is another way of doing it (a bit longer) ...........expand the expression (x+3)^2 using the formula
(a+b)^2 = a^2 +2ab +b^2 and then solve the equation