solve the second part only
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In ️ABC
By PGT
(ac)² =(ab)²+(bc)²
(4x+5)²=(x)²+(4x+4)²
16x²+25=x²+16x²+16
16x²-16x²-x²=16-25
-x²=-9
x²=9
taking square root
x=9
AB=9
BC=4x+4
4×9+4
40
AC=4x+5
4×9+5
41
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