выраэсения: \( (x-3)^{2}-(x-7)(x+1) \) при \( x=1,5 \)

d. \( 2 x^{2}+27=-21 x \)

a. \( x^{2}=49 \)

b. \( x^{2}+2 x=15 \)

Write an equation that expresses the following relationship. \( p \) varies jointly. with \( d \) and the square root of \( u \) In your equation, use \( k \) as the constant of proportionality. \( \square=\square \quad \frac{\square}{\square} \)

Write an equation that expresses the following relationship. \( u \) varies directly with \( p \) and inversely with \( d \) In your equation, use \( k \) as the constant of proportionality. पा]