boyerjasmine12 boyerjasmine12

06-03-2020
Mathematics

contestada

What is the standard form of (7-5i)(2+3i)
A. 29+11i
B. -29+11i
C. -11+29i
D. 11-29i

Respuesta :

devishri1977 devishri1977

06-03-2020

Answer:

A

Step-by-step explanation:

(7-5i)(2+3i)= 7*(2+3i) - 5i*(2+3i)

= 7*2 + 7*3i - 5i*2 - 5i*3i

= 14 + 21i -10i - 15i² {i² = -1}

= 14 + 21i - 10i -15*(-1)

= 14 + 11i + 15

= 29 + 11i

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