How to multiply this (7 + i)(6 − 7i) ?

What you need to do is first multiplying by using the Foil method. The foil method is multiplying the terms which occur last in each binomial

Than you combine the real imaginary parts of the expression. so the Answer is

49 - 43i Hope this helps :)

FOIL

7(6)+7(-7i)+6(i)+i(-7i)

42-49i+6i-7i^2

7i^2-43i+42

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step-by-step explanation:

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the arc length is found by finding the circumference of the full circle (2xpixradius) and then dividing by 4 to find just one quarter of the circle (90 degrees).