simplify (-7z)^2

Solution

simplify

(- 7 z)^{2}

49 z^{2}

Solution steps

(- 7 z)^{2}

Apply exponent rule:

(- a)^{n} = a^{n},

n

is even

(- 7 z)^{2} = (7 z)^{2}

= (7 z)^{2}

Apply exponent rule:

(a \cdot b)^{n} = a^{n} b^{n}

(7 z)^{2} = 7^{2} z^{2}

= 7^{2} z^{2}

7^{2} = 49

= 49 z^{2}

a [13] + a [7] \cdot a [20] - a \frac{13}{100} a [2]

\frac{( x ^{2} - y ^{2} )}{( x - y )}

(x^{3})^{\frac{2}{3}}

\frac{14}{( x ^{2} - 4 )} - \frac{( 6 - x )}{( x + 2 )}

(2 x)^{2} (x - x^{2}) - 4 x (- x^{3} + x^{2} - 5)