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In triangle ABC, AB=(5-x)cm,BC=(4+x)cm, angle ABC=120 and AC=y cm

Show that y^2=x^2-x+61

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use the law of cosines
y^2 = (5-x)^2 + (4+x)^2 - 2(5-x)(4+x)(-1/2)
now just expand and simplify

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