Question

If P: Q: R= 2: 3:4 and P²+ Q² + R² = 11,600,
then find (P + Q - R).​

Answer 1

Step-by-step explanation:

P= 2

Q = 3

R = 4

given p²+q²+r²= 11,600

so (Px)²+(Qx)²+(Rx)² =11,600

= (2x)²+(3x)²+(4x)²=11,600

= 4x²+9x²+16x²=11,600

=29x²=11,600

=x²=11,600÷29

=x²=400

X= √400

X=20

so

2x+3x-4x=X

5x-4x=X

(5×20)-(4×20)=X

100-80=20

so P+Q-R= 20

hope this will help

thank you