What is expand (30i-78j)(3/5 i+4/5 j) ?

The solution to expand (30i-78j)(3/5 i+4/5 j) is 18i^2+(-114ij-312j^2)/5

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expand (30i-78j)(3/5 i+4/5 j)

expand

(30 i - 78 j) (\frac{3}{5} i + \frac{4}{5} j)

18 i^{2} + \frac{- 114 ij - 312 j ^{2}}{5}

Solution steps

(30 i - 78 j) (\frac{3}{5} i + \frac{4}{5} j)

Apply FOIL method

(30 i - 78 j) (\frac{3}{5} i + \frac{4}{5} j) : 18 i^{2} + \frac{- 114 ij - 312 j ^{2}}{5}

= 18 i^{2} + \frac{- 114 ij - 312 j ^{2}}{5}

\frac{( ( 0.1 + x ) ( x ) ( 0.1 + 3 x ) )}{( ( 0.1 - x ) )}

- x \cdot (8 x^{2} + 1)

(x^{2} + 2 x) sin (x)

\frac{1}{( s ^{2} + 2 s + 2 ) ^{2}}

(2, - 1, 1) (x yz)

What is expand (30i-78j)(3/5 i+4/5 j) ?
The solution to expand (30i-78j)(3/5 i+4/5 j) is 18i^2+(-114ij-312j^2)/5