Answer:
Explanation:
(2x)²+(x+3)²=(2x+2.4)²
4x²+x²+6x+9=4x²+9.6x+5.76
5x²+6x+9-4x²-9.6x-5.76=0
x²-3.6x+3.24=0
(x-1.8) ²=0
x-1.8=0 => x=1.8 cm
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