Question

Can you help me with my work

Answer 1

1. x = ±9

2.
`x=\pm √(13)`

3. 12 and -12.

4. Antoine is incorrect. There exists two solutions x=5 and x= -5.

Explanation:

We have,

Question 1.
`x^(2)-81=0` i.e.
`x^(2)=81` i.e. x = ±9.

Question 2.
`2x^(2)-26=0` i.e.
`x^(2)-13=0` i.e.
`x^(2)=13` i.e.
`x=\pm √(13)`

Question 3. [tex]f(x)=x^{2}-144[tex]

For the roots, we take, [tex]x^{2}-144=0[tex] i.e. [tex]x^{2}=144[tex] i.e. x = ±12.

So, the options are 12 and -12.

Question 4. We have [tex]f(x)=x^{2}+25[tex]

For the roots, we take, [tex]x^{2}+25=0[tex] i.e. [tex]x^{2}=25[tex] i.e. x = ±5.

So, Antoine is incorrect. There exists two solutions x=5 and x= -5.