Question

20xsquare -78 and the value of x is -2

Answer 1

20x^2-78
Where x= - 2
=20 - 2^2-78
=20*4-78
=80-78
=2
Hope it helped you

Answer 2

20×20=400-78=322ithe value of x-2
x-2=322
x=322+2
=324