sbach732 sbach732

14-06-2020
Mathematics

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Need help with question a

Need help with question a class=

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mhanifa mhanifa

14-06-2020

Answer:

1.8 cm

6.3 cm²

Step-by-step explanation:

AC⊥BC

BD=BC=x

(x+5)²+x²=7²
x²+10x+25+x²=49
2x²+10x- 24=0
x²+5x-12=0
x=1.8

BC= 1.8 cm

Area of ABC= 1/2*1.8*7= 6.3 cm²

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