Look at these equations. 9 = 7 + a
a + 8 = b + 5
Use both equations to work out the value of b.

9=7+aequation 1

a+8=b+5equation 2

equation 1

9=7+a

9-7=a

2=a

a=2

put equation 1 into equation 2

2+8=b+5

10= b+5

10-5= b

5=b

b=5

meaning value of b=5

none of the above.

for one of the equations to be used in the process, there has to be a term in the equation since squared is .

since there is only a term in the first equation, we cannot derive a from completing the square.

solving with completing the square

don't give

take it once

try and try and you will not

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